.layout-left-nav{
    background-color: white;
    position: absolute;
    z-index: 1000;
    width: 54vw;
    height: 100vh;
    padding-top: 5vw;
}

.g_coverMaskDiv{
    position:fixed;
    left:0px;
    top:0px;
    background:rgba(0, 0, 0, 0.3);
    width:100%;  /*宽度设置为100%，这样才能使隐藏背景层覆盖原页面*/
    height:100%;
    filter:alpha(opacity=60);  /*设置透明度为60%*/
    opacity:0.6;  /*非IE浏览器下设置透明度为60%*/
    z-Index:1000;
}

